CVE-2026-105139

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (13th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Obot 0.26.0 before 0.26.2 contains an authorization bypass vulnerability that allows authenticated users matching any vMCP profile to reach prompts and resources of ungranted components. Because profiles were enforced only on tools, attackers can access prompts, resources, and resource templates through the vMCP owner's shared component connection.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 7, 2026

Last Modified

October 7, 2026

Advisory Details (7)

Auto-updated Oct 7, 2026
Patch available. Sources: github_commit, github, github_release.
generic

Obot 0.26.0 before 0.26.2 Authorization Bypass via vMCP Profile Prompts and Resources | Advisories | VulnCheck

https://www.vulncheck.com/advisories/obot-0.26.0-before-0.26.2-authorization-bypass-via-vmcp-profile-prompts-and-resources
generic

obot/pkg/mcp/vmcp.go at 8cfac5d38baa4fa0719e7975b7542608ff8bc932 · obot-platform/obot · GitHub

https://github.com/obot-platform/obot/blob/8cfac5d38baa4fa0719e7975b7542608ff8bc932/pkg/mcp/vmcp.go#L231
generic

obot/pkg/mcp/vmcp.go at 8cfac5d38baa4fa0719e7975b7542608ff8bc932 · obot-platform/obot · GitHub

https://github.com/obot-platform/obot/blob/8cfac5d38baa4fa0719e7975b7542608ff8bc932/pkg/mcp/vmcp.go#L97
github_release Patch Available

v0.26.2

Patch available: obot-platform/obot v0.26.2

https://github.com/obot-platform/obot/releases/tag/v0.26.2
githubMentions a patch (unverified)

vMCP profiles did not restrict prompts and resources · Advisory · obot-platform/obot · GitHub

https://github.com/obot-platform/obot/security/advisories/GHSA-xhpw-65qw-wj6m
generic

GitHub - obot-platform/obot: Complete AI Governance Platform from Obot AI · GitHub

https://github.com/obot-platform/obot
github_commit

commit 8d92701c2018 (obot-platform/obot)

Fix landed in obot-platform/obot commit 8d92701c2018 — awaiting tagged release

https://github.com/obot-platform/obot/commit/8d92701c2018a7b9dd6d692498fa5f41fdb912ea

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-09 15:01 UTCEG score recompute
  3. 2026-10-08 17:11 UTCEPSS rescore
  4. 2026-10-07 15:30 UTCEG score recompute
  5. 2026-10-07 14:52 UTCEG score recompute
  6. 2026-10-07 13:25 UTCEG score recompute
  7. 2026-10-07 12:37 UTCEG score recompute
  8. 2026-10-07 12:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-105139?
CVE-2026-105139 is a medium vulnerability published on October 7, 2026. Obot 0.26.0 before 0.26.2 contains an authorization bypass vulnerability that allows authenticated users matching any vMCP profile to reach prompts and resources of ungranted components. Because profiles were enforced only on tools, attackers can access prompts, resources, and resource templates…
When was CVE-2026-105139 disclosed?
CVE-2026-105139 was first published on October 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-105139 actively exploited?
CVE-2026-105139 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-105139?
CVE-2026-105139 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-105139?
A fix for CVE-2026-105139 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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